In this study, under the same conditions, two different nanoparticles, namely, titanium dioxide (TiO₂) and polyhedral oligomeric silsesquioxane (POSS) were added to the poly(lactic acid) (PLA) matrix via the solution casting technique. Morphological analysis showed that POSS had a better distribution within the PLA matrix. However, rheological analysis revealed the stronger influence of TiO₂ on shear viscosity values, and a more notable viscosity upturn at moderate to high inclusions of TiO₂ within the low shear rate zone. On the other hand, POSS was found to act as a lubricant even at a content of 3 wt% which was attributed to the very small dimensions of POSS. Such lubricating role, found from rheology, caused a boost in the crystallinity of PLA based on differential scanning calorimetry results. Moreover, it was found that TiO₂ had an adverse effect on the crystallinity of PLA which was ascribed to the hindered motions of PLA chains upon addition of moderate to high inclusions of TiO₂. The results of this study emphasize the crucial role of nanoparticle type and content on the properties of PLA.

中文翻译：

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纳米颗粒类型和含量对使用二氧化钛和多面体低聚倍半硅氧烷纳米颗粒的聚乳酸的形态，流变性和结晶度的影响

在这项研究中，在相同条件下，通过溶液流延技术将两种不同的纳米颗粒，即二氧化钛（TiO ₂）和多面体低聚倍半硅氧烷（POSS）添加到聚乳酸（PLA）基质中。形态分析表明，POSS在PLA基质中具有较好的分布。然而，流变学分析表明，TiO ₂对剪切粘度值的影响更大，并且在中等至高夹杂TiO _{2的情况下，}粘度上升更为明显。在低剪切速率区域内。另一方面，发现POSS即使在3wt％的含量下也起润滑剂的作用，这归因于POSS的非常小的尺寸。根据流变学发现，这种润滑作用基于差示扫描量热法结果提高了PLA的结晶度。此外，发现TiO ₂对PLA的结晶度具有不利影响，这归因于添加中等至高含量的TiO ₂时PLA链的运动受阻。这项研究的结果强调了纳米颗粒类型和含量对PLA性能的关键作用。